Knife attachment for mowers.



J. H. SIEGFRIBD. KNIFE ATTACHMENT FOR MOWERS.

APPLICATION FILED OCT. 19, 1911.

Ewe/afar Patented Apr. 21, 1914.

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nnrrnn srnrns PATENT OFFICE.

JOHN H. SIEGFBIED, OF LEMOORE, CALIFORNIA.

KNIFE ATTACHMENT F'O-R- MOWERS.

Application filed October 19, 1911.

To all whom it may concern Be it known that I, JOHN H. Srncrnrnn, a citizen of the United States, residing at Lemoore, in the county of Kings and State of California, have invented new and useful Improvements in Knife Attachments for Mowers, of which the following is a specification.

The present invention has reference to knife-attachments for mowers, and it comprehends certain improvements in the construction shown and described in my prior Patent No. 903795, granted November 10, 1908, the improvements in question relating more or less particularly to the construction of the knife-supporting bar and cap-plate, and to that of the keepers wherein are housed the anti-friction devices with which the rear edges of the knife-bars have contact.

The invention also resides in the particular manner in which the afore-named parts are assembled.

A structural embodiment of the invention is illustrated in the accompanying drawing, whereof- Figure 1 is a plan View, with parts broken away, of the complete attachment; Fig. 2 is a plan view of the supporting bar; Figs. 3, 4 and 5 are transverse sections taken, respectively, on the lines 33, 14, and 5-5 of Fig. 1; Figs. 6 and 7 are detail views, respectively, of one of the keepers, and one of the anti-friction devices housed therein; and Fig. 8 is a detail view of one of the antifriction devices mounted on the supporting bar.

The supporting bar, above referred to, is indicated in a general manner by the nu meral 1 in said drawing, and corresponds in the main to the usual finger bar of a mower. It is formed at its front. edge with a continuous upstanding longitudinal flange 2, and upon its upper face with a series of longitudinal seats 8 which receive the antifriction devices 4 depicted in Fig. 8, sand.- discharging slots 5 being also formed through said bar so as to intersect the seats. The anti-friction devices 1 are in the form of cylindrical rollers which are free to travel in either direction in their seats, the length of the latter being sufficiently great. to accommodate such movements; their upper surfaces project slightly above the upper face of the supporting bar, and their ends are devoid of any trunnions or the like,

Specification of Letters Patent.

Patented Apr. 21, 1914.

Serial No. 655,467.

which would require the formation of re cesses in the seat walls and thus set up friction, as well as increase the cost of manufacture.

The upper and lower knives 6 and 7 are similar in their construction to the corresponding parts shown and described in my above-identified patent, and comprise, respectively, series of blades 8 and 9, and knife-bars 10 and 11, to which said blades are secured in the usual manner. The lower knife-bar 11 rests directly upon the rollers 1, with its forward edge in close proximity to the flange 2, the latter thus acting as a retainer. Directly above the upper knifebar 10 is disposed the cap-plate 12 which is connected to the supporting bar through the agency of pairs of bolts 13 and 14: whose stems ass through registering openings in said p ate and bar. The first-named bolts are preferably flattened at their upper ends and formed with forwardly-projecting strap-like extensions 15 which rest upon the upper face of the cap-plate and are perforated to admit of the passage of the upper ends of the bolts 1& therethrough, the rear edge of the said cap-plate being recessed or cut away, as indicated by the numeral 16, so as to permit this arrangement of parts and to effect a more rigid connection of the supporting-bar and cap-plate. The two knife-bars are thus interposed between the supporting-bar and cap-plate, the said capplate being formed at its front edge with a depending retaining flange 17 which lies directly adjacent the front edge of the upper knife-bar and acts in the same manner as the upstanding flange 2 on the supporting-bar.

Between the supporting-bar and cap-plate there is disposed a plurality of casings 18 that are utilized to house anti-friction devices 19. These casings are preferably U- shaped, or substantially so, being open in front and at top and bottom; they are provided with rearwardly-extending perforated cars 20, by means of which they are bolted upon the supporting-bar, and are formed with horizontal partition walls 21 located mid-way between their upper and lower edges, said partitions constituting shelves for supporting the upper antifriction devices. These devices are preferably in the form of flat circular disks, as shown in Fig. 7, whose front portions project slightly outwardly of the casings, into contact with the rear edges of the adjacent knife-bars. The upper disks travel along the shelves 21, as above stated, while the lower disks travel along the upper face of the supporting-bar. The distance between the curved end walls of the casings is great enough to afford the disks a movement of appreciable extent.

The requisite reciprocatory movements of the knives simultaneously in opposite direc-- to travel in either direction in the seats 3.

The disks 19 which are in contact with the rear edges of the knife-bars have a similar movement within the housings 18, thus reducing all friction to a minimum.

The bolts 14 are preferably formed at their lower ends with enlarged pointed heads 24, which engage the nuts on the lower ends of the bolts 13, thereby preventing accidental rotation of said nuts.

I claim as my invention:

A knife-attachment for mowers comprising, in combination, a supporting-bar; a cap-plate disposed above and connected to said bar; a pair of superposed knives and a series of casings interposed between said bar and plate, each casing being provided with a central horizontal shelf extending from end to end thereof; and a pair of fiat circular anti-friction disks housed within each casing with their peripheries contacting with the rear edges of said knives and adapted to roll bodily longitudinally of said casing in both directions during the movements of the knives, the upper disk resting upon said shelf, and the lower disk upon said bar.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JOHN H. SIEGFRIED. Witnesses:

L. H. BYRON,

A. D. CAMPBELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

